Why doesn't it scroll to the top when you navigate between states

[TehShrike]

As phrased by @daytonlowell:

huh, totally annoying thing I just now noticed. If you're on state A and scroll down the page and then go to state B, you won't be taken back to the top when state B loads.

A reasonable question that needs a reasonable answer written down somewhere (I know I've answered it a couple times before in chats, so it really needs to be documented).

There are other general questions like this that I know need answers, so I'm thinking there should be a new markdown file at the root of the repo named "reasonable-questions.md" or something, and a list of questions linking to the answers in that file at the bottom of readme.md.

[saibotsivad]

Since maybe people will search for this and wonder, here's basically what I've done in a few apps:

const shouldScrollToTop = (currentState, previousState) => {
    return currentState === 'some state names' && previousState === 'some other states'
}

const stateChangeHistory = [];

stateRouter.on('stateChangeStart', state => {
    const previousStateName = stateChangeHistory[stateChangeHistory.length - 1]
    if (shouldScrollToTop(state.name, previousStateName)) {
        window.scrollTo(0, 0)
    }
    stateChangeHistory.push(state.name)
})